The delay has led to widespread speculation the iPhone has run into difficulty securing regulatory approval from China's Ministry of Industry and Information Technology (MIIT), with some reports suggesting the launch could be delayed until 2015.

"The iPhone 6 has entered the final stage of the approval process, now it's just a matter of time," MIIT chief Miao Wei told Tencent in an exclusive interview in Beijing. "Netizens, please wait patiently."

Miao declined to offer a time frame for completion of the review, saying only that he expected a result "very soon."